Kent James January 24, 2012 Announcements

ExQuilla is an addon for Mozilla's Thunderbird email client that allows access to both messages and contacts stored on Exchange Server 2007, 2010, or 2013. ExQuilla uses EWS (Exchange Web Services) for access to the server. ExQuilla (beginning with release 24) will work with either Thunderbird 17.* or 24.* on Windows, Linux, and OSX platforms. Support for Thunderbird 31.* will be available soon, and at that point support for Thunderbird 17 will be dropped.

ExQuilla is not free software, but is licensed on an annual basis. New users are granted a free 60 day trial license automatically. For further information on ExQuilla licensing, see the ExQuilla Licensing Overview page.


You may download the current revision of ExQuilla from this link:

Windows:  http://mesquilla.net/exquilla-currentrelease-tb-windows.xpi

Linux: http://mesquilla.net/exquilla-currentrelease-tb-linux.xpi

OSX: http://mesquilla.net/exquilla-currentrelease-tb-osx.xpi


To install, download and save this file. Then from Thunderbird, open Tools/Add-ons, click on the Addon tools button  AddonActionsIcon.png and select "Install Add-on From File". Install the downloaded file, then restart Thunderbird.


The current version of ExQuilla supports messages and contacts. Calendar features (which work with the Lightning addon) are being added experimentally, and are not yet officially supported.

Supported Messaging Features

  • Normal reading, replying, composing, sending email
  • attachments
  • Thunderbird message filters
  • Thunderbird's bayesian junk mail filters
  • Virtual folders and folder-level search

Unsupported Messaging Features

  • Synchronizing Thunderbird tags and Exchange categories
  • Offline message sending
  • Thunderbird message starring is not synchronized with Exchange message flags
  • S/MIME messages can be read but not sent

Supported Contact (Address Book) features

  • Most standard Thunderbird fields
  • Subfolders of Exchange "Contacts" folder

Unsupported Contact (Address Book) features

  • Exchange-only fields (such as Spouse)
  • User photo

Instructions and Support

After installation, follow these instructions to add an Exchange Server account to Thunderbird. For additional information or help, see ExQuilla's help resources, as a question on the general forum, or submit a support ticket (login required).

License Purchase

To buy an individual license, go to this webpage:


To buy a domain license, go to this webpage:


Individual licenses cost $10 per year.

Domain licenses cost  $25 per domain plus $5 per user (with a minimum of 5 users), per year.


Kent James July 28, 2014 Announcements

ExQuilla version 31.0 was re-released due to an issue that was discovered in accessing GAL directory entries with Thunderbird 31. The new version with the fix is version 31.0.1136. The previous version that was not displaying GAL entries was version 31.0.1135.

Additional notes on version 31.0 from the original release notice:

Version 31.0 of ExQuilla has now been released, supporting Thunderbird versions 31 and 24. Existing users who downloaded ExQuilla from the mesquilla.net site should be updated automatically within a few days. Users who downloaded from the Mozilla addons site will need to wait a few days until the review is complete there, or you may download the current revision of ExQuilla from these links:

Windows: http://mesquilla.net/exquilla-currentrelease-tb-windows.xpi

Linux: http://mesquilla.net/exquilla-currentrelease-tb-linux.xpi

OSX (Mac): http://mesquilla.net/exquilla-currentrelease-tb-osx.xpi

The Mozilla addons site (AMO) never got updated to ExQuilla version 24.7, so if you downloaded your addon from that site you might still be running version 24.6. AMO users will be upgraded from ExQuilla 24.6 to 31.0 when review is completed there.

Changes since version 24.7

  • Adds support for Thunderbird versions 31.* and drops support for Thunderbird versions earlier than 24.2 (including Thunderbird 17).
  • For users running Thunderbird 31, ExQuilla can now work with multiple NTLM-authenticated accounts to the same server without a painful workaround that greatly slowed performance. This is possible because we got a core Mozilla patch landed that fixed an underlying problem in the Mozilla platform.
  • Timeouts are added to various server calls to prevent hangs when the server never responds to a request.
  • Disable attachment download from archived message class IPM.Note.EAS which was causing hangs.